EP3279341B1 - Manufacturing method for unidirectional electromagnetic steel sheet - Google Patents

Manufacturing method for unidirectional electromagnetic steel sheet Download PDF

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Publication number
EP3279341B1
EP3279341B1 EP16773229.6A EP16773229A EP3279341B1 EP 3279341 B1 EP3279341 B1 EP 3279341B1 EP 16773229 A EP16773229 A EP 16773229A EP 3279341 B1 EP3279341 B1 EP 3279341B1
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Prior art keywords
steel sheet
cold
annealing
slab
hot
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English (en)
French (fr)
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EP3279341A4 (en
EP3279341A1 (en
Inventor
Hirotoshi Tada
Nobusato Morishige
Naoto Masumitsu
Junichi TAKAOBUSHI
Shin FURUTAKU
Masaru Takahashi
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Nippon Steel Corp
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Nippon Steel Corp
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
    • C21D3/02—Extraction of non-metals
    • C21D3/04—Decarburising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1222—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1233—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1261—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1272—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • C21D8/1283—Application of a separating or insulating coating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
    • H01F1/18—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets with insulating coating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2201/00—Treatment for obtaining particular effects
    • C21D2201/05—Grain orientation

Definitions

  • the present invention relates to a method of manufacturing a grain-oriented electrical steel sheet.
  • the grain-oriented electrical steel sheet is mainly used as an iron core material of a stationary induction apparatus such as a transformer. According to this, the grain-oriented electrical steel sheet is demanded to have characteristics such as a characteristic in which an energy loss (that is, an iron loss) when being excited with an alternating current is low, a characteristic in which permeability is high and excitation is easy, and a characteristic in which magnetostriction that becomes a cause of noise is small.
  • various developments have been made to manufacture the grain-oriented electrical steel sheet that satisfies the above-described characteristics. As a result, for example, as described in Patent Document 1, particularly, an improvement of a ⁇ 110 ⁇ ⁇ 001> orientation integration degree in a steel sheet has a great effect.
  • Patent Document 1 discloses a method of controlling MnS and AlN
  • Patent Document 2 discloses a method of controlling MnS and MnSe
  • Patent Document 3 discloses a method of controlling CuxS, CuxSe, or Cux (Se, S) and (Al, Si)N.
  • Patent Document 4 discloses a measure for adding Bi in a slab in a manufacturing method for stably obtaining an ultra-high-magnetic-flux-density grain-oriented electrical steel sheet.
  • steel contains Bi
  • Patent Document 5 to be described below discloses a technology of improving magnetic characteristics by performing an aging treatment in a process of cold-rolling a steel sheet, which is obtained after annealing of a hot-rolled steel sheet that contains Bi, to a target sheet thickness.
  • examination is not made on the film adhesiveness, and it is not clear that the aging treatment has any effect on the primary film.
  • Patent Document 6 discloses a technology of forming a satisfactory primary film.
  • a cold-rolled sheet that contains Bi is heated to 700°C or higher at a rate of 100 °C/second or faster or is heated to 700°C or higher within 10 seconds.
  • preliminary annealing in which retention is performed at a temperature of 700°C or higher for 1 second to 20 seconds, is performed, and decarburization annealing is performed.
  • the amount of TiO 2 which is added in an annealing separating agent that is subsequently applied, is increased.
  • Patent Document 6 there are lots of problems such as a problem of significantly increasing an addition amount of TiO 2 or an application amount of the annealing separating agent in order that a film is not peeled off even when a product is bent along a round bar of 20 mm ⁇ .
  • Patent Documents 7 and 8 also disclose a method of manufacturing a grain-oriented electrical steel sheet.
  • the present invention has been made in consideration of the above-described problems, and an object thereof is to provide a method of manufacturing a grain-oriented electrical steel sheet which is capable of obtaining the grain-oriented electrical steel sheet having excellent magnetic characteristics at a low cost while improving adhesiveness of a primary film.
  • the present inventors have made a thorough investigation on slab heating conditions, steel sheet retention conditions in a cold-rolling process, an effect due to a heating rate in decarburization annealing, and the like to solve the above-described problems.
  • adhesiveness of the primary film is improved by lowering a slab temperature during slab heating, and the slab is reheated and rolled, by retaining a steel sheet in a predetermined temperature range in the cold-rolling process, and by controlling the heating rate appropriately in the decarburization annealing process.
  • a slab which contains, in terms of mass%, C: 0.030% to 0.150%, Si: 2.50% to 4.00%, Mn: 0.02% to 0.30%, one or two of S and Se: 0.005% to 0.040% in a total amount, an acid-soluble Al: 0.015% to 0.040%, N: 0.0030% to 0.0150%, Bi: 0.0003% to 0.0100%, and the remainder including Fe and impurities, is used.
  • the slab which is used in the method of manufacturing the grain-oriented electrical steel sheet according to this embodiment, contains the above-described elements, and the remainder including Fe and impurities.
  • the slab may further contain 0.05 to 0.50 mass% of Sn instead of a part of Fe.
  • the slab may further contain 0.01 to 0.20 mass% of Cu instead of a part of Fe.
  • the slab may further contain one or two of Sb and Mo in a total amount of 0.0030 to 0.30 mass% instead of a part of Fe.
  • Sn, Cu, Sb, and Mo may not be contained. Accordingly, the lower limit of these elements is 0%.
  • the amount of C is set to 0.030% to 0.150%, and preferably 0.050% to 0.100%.
  • Si silicon is an element that is very effective to reduce an eddy current loss that partially constitutes an iron loss by increasing electrical resistance of steel.
  • the amount of Si is less than 2.50%, it is difficult to suppress the eddy current loss of a product.
  • the amount of Si is set to 2.50% to 4.00%, and preferably 2.90% to 3.60%.
  • Mn manganese
  • MnS and/or MnSe which are compounds called an inhibitor that influences secondary recrystallization.
  • the amount of Mn is less than 0.02%, an absolute amount of MnS and/or MnSe necessary for causing secondary recrystallization to occur becomes deficient. Accordingly, this range is not preferable.
  • amount of Mn is greater than 0.30%, since solid-solution of Mn becomes difficult when heating the slab, the amount of MnS and/or MnSe which precipitate decreases, and a precipitation size is likely to be coarse. Therefore, an optimal size distribution as an inhibitor is damaged. Accordingly, the amount of Mn is set to 0.02% to 0.30%, and preferably 0.05% to 0.25%.
  • S sulfur
  • Se seleninium
  • MnS and MnSe have the same effect as an inhibitor. Accordingly, as long as the total amount of S and Se is in a range of 0.005% to 0.040%, any one of S and Se may be contained, and both of S and Se may be contained.
  • the total amount of S and/or Se (the total amount of one or two of S and Se) is less than 0.005%, or in a case where the total amount of S and Se is greater than 0.040%, it is difficult to obtain a sufficient inhibitor effect. Accordingly, it is necessary to set the total amount of S and/or Se to 0.005% to 0.040%.
  • the total amount of S and/or Se is preferably 0.010 to 0.035%.
  • Acid-soluble aluminum is a constituent element of AlN that is an inhibitor important to obtain a high-magnetic-flux-density grain-oriented electrical steel sheet.
  • the amount of acid-soluble Al is less than 0.015%, the amount of an inhibitor becomes deficient, and inhibitor strength becomes deficient.
  • the amount of acid-soluble Al is greater than 0.040%, AlN that precipitates as an inhibitor becomes coarse. As a result, inhibitor strength decreases. Accordingly, the amount of acid-soluble Al is set to 0.015% to 0.040%, and preferably 0.018% to 0.035%.
  • N nitrogen
  • the amount of N is an important element that reacts with acid-soluble Al to form AlN.
  • the amount of N is less than 0.0030%, or in a case where the amount of N is greater than 0.0150%, it is difficult to obtain a sufficient inhibitor effect. Accordingly, the amount of N is limited to 0.0030% to 0.0150%, and preferably 0.0050% to 0.0120%.
  • Bi bismuth
  • the amount of Bi is set to 0.0003% to 0.0100%, preferably 0.0005% to 0.0090%, and more preferably 0.0007% to 0.0080%.
  • Sn (tin) is not necessary to be contained, but Sn is an element that is effective to stably attain secondary recrystallization of a thin product.
  • Sn is an element having effect of making a secondary recrystallized grain be small.
  • the amount of Sn is more preferably 0.08% to 0.30%.
  • Cu copper
  • Cu is an element that is effective to improve a primary film of steel that contains Sn.
  • the amount of Cu is less than 0.01%, an effect of improving the primary film is small. Accordingly, it is preferable that the amount of Cu is set to 0.01% or greater to obtain the effect.
  • the amount of Cu is set to 0.01% to 0.20%, and more preferably 0.03% to 0.18%.
  • Sb (antimony) and Mo (molybdenum) are not necessary to be contained, but Sb and Mo are effective for stably obtaining secondary recrystallization of a thin product.
  • the total amount of Sb and/or Mo (the total amount of one or two of Sb and Mo) is set to 0.0030% or greater. Any one of Sb and Mo may be contained, or both of Sb and Mo may be contained.
  • the total amount of Sb and/or Mo is greater than 0.30%, the above-described effect is saturated. Accordingly, even when being contained, it is preferable that the total amount of Sb and/or Mo is set to 0.30% or less, and more preferably 0.0050% to 0.25%.
  • the slab, of which components are adjusted in the above-described ranges, is heated prior to hot-rolling.
  • the slab is obtained by casting molten steel of which components are adjusted in the above-described ranges.
  • a casting method is not particularly limited, and a casting method of molten steel for manufacturing of a typical grain-oriented electrical steel sheet may be applied.
  • the slab when heating the slab having the above described components, the slab is heated to T1°C of 1150°C to 1300°C, and is retained (soaked) at T1°C for 5 minutes to 30 hours. Then, the temperature of the slab is lowered to T2°C that is equal to or lower than T1-50°C (that is, T1-T2 ⁇ 50). Then, the slab is heated again to T3°C of 1280°C to 1450°C, and is retained at T3°C for 5 minutes to 60 minutes.
  • T3 is preferably 1300°C or higher.
  • T3 is preferably 1400°C or lower.
  • the retention time at T1°C or T3°C is set to 30 hours or shorter, and preferably 25 hours or shorter.
  • the retention time at T3°C is 60 minutes or shorter, and preferably 50 minutes or shorter.
  • T1-T2 is less than 50°C (T1-T2 ⁇ 50)
  • film adhesiveness deteriorates. This mechanism is not clear, but it is considered that the deterioration is caused by a variation in a surface quality of a steel sheet due to a variation in a behavior of scale formation and descaling during slab heating and hot-rolling.
  • T1-T2 is set to 200°C or lower. That is, it is preferable to satisfy a relationship of 50 ⁇ T1 -T2 ⁇ 200.
  • the temperature of the slab is a surface temperature.
  • temperature lowering from T1°C to T2°C may be performed by any method such as water cooling and air cooling, but the air cooling (radiation cooling) is preferable.
  • the slab which is heated in the heating process, is hot-rolled to obtain a hot-rolled steel sheet.
  • Conditions of the hot-rolling are not particularly limited and conditions which are applied to a typical grain-oriented electrical steel sheet may be employed.
  • a cold-rolling process cold-rolling including a plurality of passes is performed to obtain a cold-rolled steel sheet having a sheet thickness of 0.30 mm or less.
  • the sheet thickness after the cold-rolling process is set to 0.30 mm or less, and preferably 0.27 mm or less.
  • the lower limit of the sheet thickness after the cold-rolling process is not particularly limited, but it is preferable that the thickness is set to, for example, 0.10 mm or greater, and more preferably 0.15 mm or greater.
  • a retention treatment in which the steel sheet is retained at a temperature of 130°C to 300°C for 3 minutes to 120 minutes, is performed one or more times during the passes.
  • a retention treatment aging treatment
  • [Bi] in Expression (1) represents the amount of Bi in the slab (unit: mass%).
  • the aging treatment temperature is lower than 130°C, or the retention time is shorter than 3 minutes, it is difficult to attain desired magnetic characteristics.
  • the aging treatment temperature is higher than 300°C, a special facility is necessary, and the manufacturing cost increases. Therefore, this range is not preferable.
  • the retention time is longer than 120 minutes, productivity deteriorates, and the manufacturing cost increases. Therefore, this range is not preferable.
  • Preferable aging treatment conditions are as in the following Expression (1').
  • the retention treatment (aging treatment) of the cold-rolling process is performed under the following conditions instead of the above-described conditions. That is, it is preferable that an aging treatment to retain at a temperature of 140°C to 300°C for 5 minutes to 120 minutes is performed two or more times, and an aging treatment to retain at a temperature T°C satisfying the following Expression (1') for 5 minutes to 120 minutes is performed one time to four times. When satisfying the conditions, the film adhesiveness is improved in more stable manner. 175 + Bi ⁇ 5000 ⁇ T ⁇ 300
  • intermediate annealing is performed with respect to the hot-rolled steel sheet at least one time (preferably one time or two times).
  • cold-rolling is performed after annealing (so-called hot-rolled sheet annealing) is performed with respect to the hot-rolled steel sheet before the cold-rolling
  • the plurality of passes of cold-rolling including intermediate annealing are performed without performing the hot-rolled sheet annealing, or the plurality of passes of cold-rolling including intermediate annealing are performed after the hot-rolled sheet annealing.
  • the annealing temperature is set to 1000°C to 1200°C, and preferably 1030°C to 1170°C.
  • the annealing time is set to 5 seconds to 180 seconds, and preferably 10 seconds to 120 seconds.
  • Decarburization annealing is performed with respect to the cold-rolled steel sheet after the cold-rolling process.
  • a heating rate during heating in the decarburization annealing is set to 50 °C/second or faster.
  • the heating temperature, the heating time, and the like in the decarburization annealing conditions which are applied to a typical grain-oriented electrical steel sheet may be employed.
  • the heating rate in the decarburization annealing is slower than 50 °C/second, it is difficult to obtain desired magnetic characteristics and film adhesiveness. Accordingly, the heating rate is set to 50 °C/second or faster, and preferably 80 °C/second or faster.
  • the upper limit of the heating rate is not particularly limited, but special facility is necessary to excessively raise the heating rate. Therefore, the heating rate is set to 2000 °C/second or slower.
  • An annealing separating agent is applied onto the cold-rolled steel sheet after the decarburization annealing, and final annealing is performed. According to this, a film (primary film) is formed on a surface of the cold-rolled steel sheet.
  • An atmosphere gas that is used in the final annealing are not particularly limited, and a typically used atmosphere gas such as a gas containing nitrogen and hydrogen may be used.
  • a typically used atmosphere gas such as a gas containing nitrogen and hydrogen
  • methods or conditions in the annealing separating agent application and the final annealing methods or conditions which are applied to a typical grain-oriented electrical steel sheet may be employed.
  • the annealing separating agent an annealing separating agent including MgO as a main component may be used.
  • a film, which is formed after the final annealing contains forsterite (Mg 2 SiO 4 ).
  • an X value which is calculated by the following Expression (2), is set to 0.0003 Nm 3 /(h ⁇ m 2 ) or greater.
  • the film adhesiveness is further improved.
  • X Atmosphere gas flow rate / total steel sheet surface area
  • the atmosphere gas flow rate represents the amount of the atmosphere gas that is flowed in when performing box annealing.
  • the total steel sheet surface area represents an area of a steel sheet that is in contact with the atmosphere, and a total area of a front surface and a rear surface of the steel sheet in a thin steel sheet.
  • the X value which is calculated by Expression (2), is more preferably to 0.0005 Nm 3 /(h ⁇ M 2 ) or greater.
  • the upper limit of the X value is not particularly limited, but it is preferable that the X value is set to 0.0030 Nm 3 /(h ⁇ m 2 ) or less from the viewpoint of the manufacturing cost.
  • An insulating film is applied onto the steel sheet (cold-rolled steel sheet) on which the primary film is formed. According to this, a secondary film is formed on the steel sheet.
  • An application method is not particularly limited, and a method or conditions which are applied to a typical grain-oriented electrical steel sheet may be employed.
  • Laser irradiation may be performed with respect to the steel sheet, on which the secondary film is formed.
  • a groove is formed in the film or a strain is applied to the film through the laser irradiation, it is possible to further improve magnetic characteristics of the grain-oriented electrical steel sheet due to magnetic domain refinement.
  • a value of a magnetic flux density B8 is 1.92 T or greater. Accordingly, the grain-oriented electrical steel sheet has excellent magnetic flux density. In addition, film adhesiveness becomes satisfactory in the steel sheet.
  • the adhesiveness of the film is improved.
  • the reason for this is not clear, but it is considered that the improvement is caused by a variation in surface quality of the steel sheet.
  • the magnetic characteristics can be measured by a known method such as a method based on an Epstein test defined in JIS C 2550, and a single sheet magnetic characteristic test method (single sheet tester: SST) defined in JIS C 2556.
  • a slab which contains C: 0.080%, Si: 3.20%, Mn: 0.07%, S: 0.023%, acid-soluble Al: 0.026%, N: 0.0090%, Bi: 0.0015%, and the remainder including Fe and impurities, was heated to a temperature T1 °C of 1130°C to 1280°C in terms of a surface temperature, and then retention was performed for 5 hours. Then, the surface temperature of the slab was lowered to a temperature T2°C of 1050°C to 1220°C. Then, the surface temperature of the slab was raised to 1350°C, and retention was performed for 20 minutes. Then, hot-rolling was performed with respect to the slab to obtain a hot-rolled coil having a thickness of 2.3 mm.
  • intermediate annealing in which retention is performed at a temperature of 1120°C for 20 seconds, was performed with respect to the hot-rolled coil and then cold-rolling was performed, and cold-rolling was performed to obtain a cold-rolled steel sheet having a thickness of 0.22 mm.
  • decarburization annealing was performed with respect to the cold-rolled steel sheet under conditions in which a heating temperature was set to 850°C and retention time was set to 120 seconds. A heating rate at this time was set to 300 °C/second.
  • an annealing separating agent containing MgO as a main component was applied onto the cold-rolled steel sheet, and final annealing was performed in an atmosphere gas containing nitrogen and hydrogen in a ratio of 3:1 in a state in which a gas flow rate, that is, atmosphere gas flow rate/total steel sheet surface area was set to 0.0008 Nm 3 /(h ⁇ m 2 ). Then, application of a secondary film (insulating film) was performed.
  • a magnetic flux density B8 when being magnetized with 800 A/m was measured by single sheet magnetic measurement (SST) defined in JIS C 2556, and adhesiveness of the film was evaluated.
  • the film adhesiveness was evaluated as the following grades A to D. That is, a case where peeling-off did not occur at a 10 ⁇ bending test was evaluated as A, a case where peeling-off did not occur at a 20 ⁇ bending test was evaluated as B, a case where peeling-off did not occur at a 30 ⁇ bending test was evaluated as C, and a case where peeling-off occurred at a 30 ⁇ bending test was evaluated as D.
  • a and B were determined as passing.
  • the magnetic flux density B8 1.92 T or greater was determined as passing.
  • hot-rolled sheet annealing in which retention is performed at a temperature of 1100°C for 30 seconds, was performed with respect to the hot-rolled coil and cold-rolling was performed, and cold-rolling including an aging treatment was performed to obtain a cold-rolled steel sheet having a thickness of 0.22 mm.
  • a temperature, time, and the number of times of the aging treatment were variously changed.
  • decarburization annealing was performed with respect to the cold-rolled steel sheet under conditions in which a heating temperature was set to 850°C and retention time was set to 150 seconds.
  • a heating rate in the decarburization annealing was set to 350 °C/second.
  • an annealing separating agent containing MgO as a main component was applied onto the cold-rolled steel sheet, and final annealing was performed in an atmosphere gas containing nitrogen and hydrogen in a ratio of 3:1 in a state in which a gas flow rate, that is, atmosphere gas flow rate/total steel sheet surface area was set to 0.0006 Nm 3 /(h ⁇ m 2 ). Then, application of a secondary film was performed.
  • the magnetic flux density B8 when being magnetized with 800 A/m was measured by the single sheet magnetic measurement (SST), and adhesiveness of the film was evaluated.
  • An evaluation method and the passing standard were the same as in Example 1.
  • Grades which represent the magnetic flux density B8 and the film adhesiveness, are illustrated in Table 2.
  • a relationship between the highest temperature in the aging treatment and the amount of Bi is illustrated in FIG. 1
  • a relationship between the number of times of the aging treatment satisfying Expression (1), and the number of times of the aging treatment at 130°C to 300°C is illustrated in FIG. 2 [Table 2] STEEL SHEET NO.
  • a slab which contains C: 0.078%, Si: 3.25%, Mn: 0.07%, S: 0.024%, acid-soluble Al: 0.026%, N: 0.0082%, and Bi: 0.0024%, was heated until the slab surface temperature reached 1180°C (T1°C), and then retention was performed for 1 hour. Then, the surface temperature of the slab was lowered until reaching 1090°C (T2°C). Then, the slab was heated until the surface temperature of the slab reached 1360°C (T3°C), and retention was performed for 45 minutes. Then, the slab was hot-rolled to obtain a hot-rolled coil having a thickness of 2.3 mm.
  • hot-rolled sheet annealing in which retention is performed at a temperature of 950°C to 1150°C for 50 seconds, was performed with respect to the hot-rolled coil and then cold-rolling was performed to obtain a cold-rolled steel sheet having a sheet thickness of 0.22 mm.
  • an aging treatment in which retention is performed at a temperature of 160°C for 30 minutes, was performed two times, and an aging treatment, in which retention is performed at a temperature of 240°C for 30 minutes was performed.
  • decarburization annealing was performed with respect to the cold-rolled steel sheet under conditions in which a heating temperature was set to 820°C and retention time was set to 150 seconds. At this time, a heating rate in the decarburization annealing was set to 20 °C/second to 400 °C/second.
  • an annealing separating agent containing MgO as a main component was applied onto the cold-rolled steel sheet, and final annealing was performed in an atmosphere gas containing nitrogen and hydrogen in a ratio of 2:1 in a state in which a gas flow rate, that is, atmosphere gas flow rate/total steel sheet surface area was set to 0.0010 Nm 3 /(h ⁇ m 2 ). Then, application of a secondary film (insulating film) was performed.
  • the intermediate annealing (hot-rolled sheet annealing) temperature and the heating rate in the decarburization annealing process are illustrated in Table 3.
  • FIG. 3 illustrates preferable ranges of the heating rate in the decarburization annealing and the hot-rolled sheet annealing temperature.
  • a sheet thickness of some of the annealed steel sheets was set to 0.22 mm through cold-rolling, and a sheet thickness of the remaining annealed steel sheets were set to an intermediate sheet thickness of 1.9 mm to 2.1 mm. Then, intermediate annealing, in which retention is performed at a temperature of 1080°C to 1100°C for 20 seconds, was performed, and cold-rolling was performed to obtain a sheet thickness of 0.22 mm. In cold-rolling for obtaining the final sheet thickness, an aging treatment was performed in which retention is performed at a temperature of 160°C for 20 minutes, and an aging treatment was performed in which retention is performed at a temperature of 250°C for 5 minutes. The decarburization annealing, in which retention is performed at a temperature of 800°C for 180 seconds, was performed with respect to the cold-rolled steel sheets.
  • an annealing separating agent containing MgO as a main component was applied onto the cold-rolled steel sheets, and final annealing was performed in an atmosphere gas containing nitrogen and hydrogen in a ratio of 1:2 in a state in which a gas flow rate, that is, atmosphere gas flow rate/total steel sheet surface area was set to 0.0025 Nm 3 /(h ⁇ m 2 ).

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BR112017020121B1 (pt) 2021-07-20
WO2016159349A1 (ja) 2016-10-06
EP3279341A4 (en) 2018-08-22
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JP6369626B2 (ja) 2018-08-08
EP3279341A1 (en) 2018-02-07
US20180282830A1 (en) 2018-10-04
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US10669600B2 (en) 2020-06-02
RU2686725C1 (ru) 2019-04-30

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